Locker in rear to front
12-18-2010, 08:33 AM
#4
Registered User
Front axle 1979 - 1985 TOYOTA 8" rg 30 Beam axle 92-2080-3001 POWERTRAX
Rear axle 1969 - 1995 TOYOTA 8" rg 30 All 4WD, 4 cyl 92-2080-3001 POWERTRAX
Lockrite
Front axle 1984 - 1985 TOYOTA 8" rg 30 All 1610 Lockrite
Rear Axle 1984 - 1989 TOYOTA 8" rg 30 except V6 1610 Lockrite
same part numbers, I say yes.
Rear axle 1969 - 1995 TOYOTA 8" rg 30 All 4WD, 4 cyl 92-2080-3001 POWERTRAX
Lockrite
Front axle 1984 - 1985 TOYOTA 8" rg 30 All 1610 Lockrite
Rear Axle 1984 - 1989 TOYOTA 8" rg 30 except V6 1610 Lockrite
same part numbers, I say yes.
12-18-2010, 08:36 AM
#5
Registered User
12-18-2010, 08:39 AM
#6
Registered User
now question I have is I know the trail-gear says high pinion 3rds should only be used in front. I know the ring and pinions are the same, but can you run the rear third in the high pinion front? I say no but in case this guy is considering swapping out his entire third to the front, well.
12-18-2010, 08:43 AM
#7
now question I have is I know the trail-gear says high pinion 3rds should only be used in front. I know the ring and pinions are the same, but can you run the rear third in the high pinion front? I say no but in case this guy is considering swapping out his entire third to the front, well.
- http://www.4crawler.com/4x4/4R_TechI...everseCutGears
In fact the very HP 3rd I am running in the front of my '85 is the same one Marlin had tried to run in the rear axle of his long bed p/u years ago. He broke R+P gears in it twice before giving up on the idea.
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12-18-2010, 08:46 AM
#8
Registered User
thanks 4Crawler, even though I don't have a SA truck, it's nice to know. I knew about the reverse cut for the front. Just wasn't sure about running the rear in the front, I guess you can, but why would you since the pinion is lower. 
Come to think of it I guess it's pretty much like doing a RUF SAS.
Come to think of it I guess it's pretty much like doing a RUF SAS.
Last edited by xxxtreme22r; 12-18-2010 at 08:48 AM.
12-18-2010, 09:35 AM
#9
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XXXtreme,
I think you have it a little backwards. On the SA pickups, both the front and rear 3rd members (R&P,diff, housing) are the same. The HP fronts came on later model land cruisers (FZJ80's if I'm not mistaken) to clear the tie rod (or is it a drag link on a SA?) under the front driveshaft. On these HP diffs the R&P is different but the carrier is the same. So you could get a locker for a regular 8" (I think they are all V6 style) but you can only run the HP reverse cut gears, and I believe the ratios are much more limited than for reg rotation V6 R&P.
I think you have it a little backwards. On the SA pickups, both the front and rear 3rd members (R&P,diff, housing) are the same. The HP fronts came on later model land cruisers (FZJ80's if I'm not mistaken) to clear the tie rod (or is it a drag link on a SA?) under the front driveshaft. On these HP diffs the R&P is different but the carrier is the same. So you could get a locker for a regular 8" (I think they are all V6 style) but you can only run the HP reverse cut gears, and I believe the ratios are much more limited than for reg rotation V6 R&P.
12-18-2010, 11:55 AM
#11
The 8" HP diff is a direct bolt-in swap any other 8" axle housing(non-IFS). The carriers are also the same as the 4-pinion V6/Turbo 8".
‘90-97 Landcruiser (FJ-80 and FZJ-80) uses a high pinion, reverse-cut front diff based on the V6/Turbo rear diff. The high pinion design allows the steering on these vehicles to run behind the axle and under the driveshaft. Carriers (i.e. lockers, LSD's) from the 8" V6/Turbo diffs can be installed (direct bolt-in) in the hi-pinion diff. The entire diff is also a direct bolt-in to all front and rear axles that use an 8" diff.
This diff is desirable to some straight-axle mini-truck and 4runner owners for a couple of reasons. First, the reverse-cut design of the gears is stronger than simply using a rear diff and gears up front as the factory did since its not using the weaker "coast" side of the gears when driving forward. For this reason, this diff is generally only used in the front axle. Second, the hi-pinion design gives very good ground clearance for the pinion and driveshaft as well as improves driveshaft operating angles.
In North America, almost all of these diffs came from the factory with 4.10 gears. Aftermarket gears for this diff are more expensive than most since they are either imported or custom made in limited quantities. At this time 4.88 and 5.29 are the only aftermarket ratios available.
Either the LP or HP 8" electric lockers will fit any 8" axle housing(non-IFS) with modification to the axle housing.
A factory option on 3rd Gen. 4Runners, Tacoma 4x4's, and Tacoma PreRunner 4x2's is an electric locking rear differential. This diff is a 4-pinon design based on the Turbo/V6 8" diff and uses the same gear sets and bearings (except for the large bearing near the locking mechanism).
These locking diffs can be retrofitted into 8" diff axles if the axle housing is modified (see this article for more info). It cannot be easily retrofitted into a T100/Tundra or open-diff Tacoma style axle housing because the mounting bolt pattern is smaller. It "could" be done by an axle builder by doing major work to the mounting flange, but that is not really a practical option.
- 30 spline pinion on OEM gears, swap pinion flange to 27 spline to use aftermarket gears
A factory option on ‘93-97 Landcruiser FZJ-80's is a hi-pinion electric locking front differential. It can be installed into modified 8" axle housings, similar to the 4Runner/Tacoma locker mentioned above. The reverse-cut gear sets for this diff are the same as for the standard hi-pinion diff mentioned earlier. These vehicles also had an optional 8.875" REAR electric locker. This one has been retrofitted into other Landcruiser models with considerable effort (see this article), but it doesn't appear to be compatible with any non-Landcruiser vehicles.
The FJ, Taco, 4Runner, Tundra, Sequoia IFS front axles are 8" mid-pinion. And won't fit in any other 8"(no third member), and have no parts but the pinion bearings that are the same as any other 8". The pinion bearings are the same as the V6/Turbo 8".
'03+ 4runner, '04+ Tacoma, FJ Cruiser, '05-07 Tundra, ?? Sequoia: 8" IFS diff.
- Driver's side
- Mid-pinion
- Clamshell housing
- 30 spline axles
- Carrier break: 3.91 and up, 3.73 and down.
Posted by RockKrawler of Allpro Offroad 1-25-07
"The front differential is an 8" mid pinion IFS that uses a gear not available through the common aftermarket. It is the same as the Non-US Toyota Prado front differential. The only current ratios available are 4.56 from Toyota OEM Japan and 4.88 from Mossiero in Italy. All Pro has 4.56 OEM Toyota Gears in stock, and 4.88 on the way in.
Front install kits are also not available from the common aftermarket. It uses the rear 86-95 V6 pinion bearings, but everything else is unique to the FJ/Prado. All Pro has gathered the parts together and can assemble a kit for you by special order, and have preassembled kits in the works. No solid spacers are available for the front differential.
One last thing - there is a case break on the front differential. This means there are 2 different cases, or differential offsets: one that fits 3.73 and down, and the other that fits 3.91 and up. So if you have an Automatic FJ with 3.73 gears and want to go to a 3.91, 4.56 or 4.88 ratio, you need an open diff from a stick shift wth the factory 3.91, or you can change to an aftermarket diff like an ARB and get yourself some extra traction at the same time.
http://home.4x4wire.com/erik/diffs/
The Hi-pinion 8" diff
‘90-97 Landcruiser (FJ-80 and FZJ-80) uses a high pinion, reverse-cut front diff based on the V6/Turbo rear diff. The high pinion design allows the steering on these vehicles to run behind the axle and under the driveshaft. Carriers (i.e. lockers, LSD's) from the 8" V6/Turbo diffs can be installed (direct bolt-in) in the hi-pinion diff. The entire diff is also a direct bolt-in to all front and rear axles that use an 8" diff.
This diff is desirable to some straight-axle mini-truck and 4runner owners for a couple of reasons. First, the reverse-cut design of the gears is stronger than simply using a rear diff and gears up front as the factory did since its not using the weaker "coast" side of the gears when driving forward. For this reason, this diff is generally only used in the front axle. Second, the hi-pinion design gives very good ground clearance for the pinion and driveshaft as well as improves driveshaft operating angles.
In North America, almost all of these diffs came from the factory with 4.10 gears. Aftermarket gears for this diff are more expensive than most since they are either imported or custom made in limited quantities. At this time 4.88 and 5.29 are the only aftermarket ratios available.
Electric Locker
A factory option on 3rd Gen. 4Runners, Tacoma 4x4's, and Tacoma PreRunner 4x2's is an electric locking rear differential. This diff is a 4-pinon design based on the Turbo/V6 8" diff and uses the same gear sets and bearings (except for the large bearing near the locking mechanism).
These locking diffs can be retrofitted into 8" diff axles if the axle housing is modified (see this article for more info). It cannot be easily retrofitted into a T100/Tundra or open-diff Tacoma style axle housing because the mounting bolt pattern is smaller. It "could" be done by an axle builder by doing major work to the mounting flange, but that is not really a practical option.
- 30 spline pinion on OEM gears, swap pinion flange to 27 spline to use aftermarket gears
Hi-pinion Electric Locker
A factory option on ‘93-97 Landcruiser FZJ-80's is a hi-pinion electric locking front differential. It can be installed into modified 8" axle housings, similar to the 4Runner/Tacoma locker mentioned above. The reverse-cut gear sets for this diff are the same as for the standard hi-pinion diff mentioned earlier. These vehicles also had an optional 8.875" REAR electric locker. This one has been retrofitted into other Landcruiser models with considerable effort (see this article), but it doesn't appear to be compatible with any non-Landcruiser vehicles.
8" IFS diff
'03+ 4runner, '04+ Tacoma, FJ Cruiser, '05-07 Tundra, ?? Sequoia: 8" IFS diff.
- Driver's side
- Mid-pinion
- Clamshell housing
- 30 spline axles
- Carrier break: 3.91 and up, 3.73 and down.
Posted by RockKrawler of Allpro Offroad 1-25-07
"The front differential is an 8" mid pinion IFS that uses a gear not available through the common aftermarket. It is the same as the Non-US Toyota Prado front differential. The only current ratios available are 4.56 from Toyota OEM Japan and 4.88 from Mossiero in Italy. All Pro has 4.56 OEM Toyota Gears in stock, and 4.88 on the way in.
Front install kits are also not available from the common aftermarket. It uses the rear 86-95 V6 pinion bearings, but everything else is unique to the FJ/Prado. All Pro has gathered the parts together and can assemble a kit for you by special order, and have preassembled kits in the works. No solid spacers are available for the front differential.
One last thing - there is a case break on the front differential. This means there are 2 different cases, or differential offsets: one that fits 3.73 and down, and the other that fits 3.91 and up. So if you have an Automatic FJ with 3.73 gears and want to go to a 3.91, 4.56 or 4.88 ratio, you need an open diff from a stick shift wth the factory 3.91, or you can change to an aftermarket diff like an ARB and get yourself some extra traction at the same time.
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